Gas locker door lock malfunction

[mapman]

Gas locker lock sticks once handle pulled to open and sticks in open position. Interior catch remains retracted as in photo B, can manually push T piece back in (photo A) and then slam door shut.
Is it possible to dismantle lock easily to clean? Have tried WD40.
If I need a replacement does anyone know the make of lock? No ID on either interior or exterior fittings.
Thanks if anyone can help.

 

[peterc10]

You should not use WD40 on locks. It is not a long term lubricant and instead it removes any lubricant that is. And it can cause plastic to expand. Try some silicone lubricant in a spray can.

 

[mapman]

Ok. Thanks for that.

 

[Clivefog]

Undo the 4 screws to remove the cover, lock should stay in place (note I said should), you can now see the lock mechanism. Look for wear on any plastic part. Silicon lube every thing and see what happens.

 

[Lenny HB]

Take the latch apart it's either going to be a worn plastic part or a broken spring.